Owen Farrell’s perfect balance of keeping a cool head alongside an intense physical performance can help drive Saracens on through the business end of the season, according to director of rugby Mark McCall.

Farrell – who sat out the Guinness Six Nations to prioritise his mental health – made an impressive return to competitive action in the crushing 52-7 Gallagher Premiership win over Harlequins on Saturday.

The 32-year-old fly-half is set to joins French club Racing 92 in the summer, a move which will make the long-serving England captain ineligible for international selection.

Despite the additional scrutiny, Farrell produced an impressive all-round individual display as Quins were swept aside at the Tottenham Hotspur Stadium in what was his 250th club appearance.

Saracens sit third in the table and now just three points behind leaders Northampton ahead of their meeting at Franklin’s Gardens on Friday night.

With a Champions Cup last-16 fixture away at Bordeaux also on the horizon, McCall knows he will need Farrell and all of his key men fully focused to tackle the challenges ahead.

“His performance on Saturday was high level,” McCall said.

“He passed the ball beautifully during the game and managed the game well, but just looked in control of everything.

“He looked like he had time in everything that was doing, so he had that lovely mix, which is the sweet spot for a player where you can be calm and cool, but very physical when you need to be and very intense when you need to be.

“He was able to be intense, to be physical and then come out of that and see when he needed to see and that’s always a sign of a very good player.”

McCall knows Saracens will need a high collective effort when they face Saints and is not reading too much into last week’s 52-21 at Bristol.

“I don’t think anyone should be fooled by what happened on Friday night,” McCall said. “Those kind of things can happen – it has happened to us a couple of times this year.

“They are good all-round and have taken their defence to a whole new level this year.

“They have been building for a long time and have a pile of cohesion in their team and we all know they are one of the best attacking teams in the country.”

Saracens looks set to again be without winger Rotimi Segun, who was a late withdrawal from the side to face Quins because of an Achilles problem.

Maro Itoje continues to be assessed on a knee issue sustained while on England duty, so may be rested.

McCall, meanwhile, confirmed the club had reviewed an incident during the Quins game when the television match official appeared to ignore possible foul play because it was highlighted by a pundit.

Former England international Austin Healey – who was working as part of TNT Sports’ team at the match – spotted a clear-out by Harlequins captain Stephan Lewies, when he appeared to slide on his knees into Farrell.

Player welfare group Progressive Rugby described the decision to ignore possible foul play by TMO Stuart Terheege in his discussions with referee Christophe Ridley as “hugely concerning”.

McCall, though, looked to draw a line under the matter, saying: “We did obviously (review the incident).

“But I haven’t got too much to say about it – other than in an ideal world, I suppose, if there is something that needs to be looked at by the officials, it gets looked at.”

England captain Jamie George has been hailed as “incredible” ahead of his return to club rugby after resolutely leading his country through a Guinness Six Nations campaign during which his mother died.

Saracens hooker George discovered his mum Jane had been diagnosed with cancer on the same day he was appointed national team skipper in place of club-mate Owen Farrell.

She died from the illness on February 14, four days after England’s 16-14 round-two win over Wales at Twickenham.

 Sarries director of rugby Mark McCall saluted George’s strength of character as he contemplates including him in his squad for Saturday’s Gallagher Premiership clash with rivals Harlequins.

“Just talking to our England players who were there, I think it was quite remarkable how he was able to go and captain the side,” said McCall.

“The first time being a captain of that side and to have suffered what he suffered with his mum dying as suddenly as she did.

“And they said he was incredible. He’s highly popular amongst all the playing group from all the clubs, so he did an incredible job.”

George started each of his country’s five matches during the championship amid a difficult time in his personal life.

The 33-year-old has been given time off since the tournament but could still feature in this weekend’s derby with Quins at Tottenham Hotspur Stadium as fly-half Farrell prepares for a milestone appearance for Saracens.

“We haven’t seen him this week,” said McCall. “We’ve given some some time away.

“He might (be involved), you never know. It’s Owen’s 250th game and he’s one of Owen’s best friends.

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“What he didn’t need was a couple of training days, to be honest.

“He’s got a new baby. He needed to be at home with his family and he’s the sort of person that we would trust with one practice to come and be part of the 23 if he really wants to be part of Owen’s big day.”

Saracens captain Farrell, who sat out the Six Nations to prioritise his mental health, echoed McCall’s comments

“Jamie’s obviously had a lot going on recently,” he said.

“I thought the way he’s held himself over that period and led the team was outstanding and you can see by the way the boys ended up playing it really built up well through that time. I couldn’t be prouder.”

Reigning champions Saracens begin the Premiership run-in sitting fourth in the table as an era draws to a close.

Captain Farrell will join French side Racing 92 in the summer, while Mako Vunipola, who is available following a ban, and brother Billy are also set to depart.

“I don’t want to talk without them having completely finalised their plans,” McCall said of the Vunipolas. “But they are coming towards the end of their time with us.”

Owen Farrell will make his first appearance since his decision to step away from Test rugby was announced when Saracens launch their Investec Champions Cup campaign on Saturday.

England captain Farrell will be unavailable for the Six Nations later this season after choosing to take a break from the international game to prioritise his and his family’s mental well-being.

He then missed Saracens’ Gallagher Premiership defeat against Northampton due to a knee problem.

But Saracens rugby director Mark McCall has confirmed the 32-year-old fly-half will face leading South African challengers the Bulls in Pretoria.

“He’s available and he is going to play this weekend,” McCall said. “He has trained fully over the last two days.

“He has enjoyed being with his team-mates, and it is a great opportunity for us all to spend a bit of time together away from the British winter.

“I don’t know how many European Cup games he has played – him and Alex Goode have probably played in more than anybody at the club.

“He is our captain, he is our leader, someone who is respected by everyone at the club. To have him on the field, of course, is an enormous benefit.

“Not just to have him on the field, but have him in the team-room, in the meetings… His contribution is so enormous and it is great to have him here with us.”

Three-time European champions Saracens have won the tournament more than any other English club, although they made a quarter-final exit last term to eventual winners La Rochelle.

And they will tackle a Bulls side currently third in the United Rugby Championship, having won five out of seven league fixtures this season.

McCall added: “We have been really impressed with what we have seen, especially in their last couple of home games. They are strong in all areas.

“Games don’t get much tougher in round one than coming to the Bulls, especially with the run of form they are on, but it is a challenge which usually brings the best out of the group we have got.

“We’ve had a good relationship with this competition for a very long period of time. It has felt really good on the training field from the moment we touched down here.”